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Thanks for your help @Denis Bourgeois. As outlined in your previous instructions, we ran a measure in OpenStudio which generated the trench ground field and an associated OS:Site:GroundTemperature:Undisturbed:KusudaAchenbach object. We then modified the default parameters for KusudaAchenbach in the osm file because OpenStudio's interface didn't seem to allow revisions to this object's parameters. For anybody who has this issue in the future, here is the code for the measure that we ran:

 # start the measure
 class AddHorizontalTrenchFieldForGSHP < OpenStudio::Measure::ModelMeasure
   # human readable name
   def name
     return "Add trench horizontal ground field for GSHP."
   end
   # human readable description
   def description
     return "This measure adds a trench horizontal ground field."
   end
   # human readable description of modeling approach
   def modeler_description
     return " This measure adds a trench horizontal ground field. "
   end
 
# define what happens when the measure is run
  def run(model, runner, user_arguments)
    super(model, runner, user_arguments)
    trench     = OpenStudio::Model::GroundHeatExchangerHorizontalTrench.new(model)
    loop       = model.getPlantLoopByName("GSHP Loop Name").get
    loop.addSupplyBranchForComponent(trench)
   end
 end
 
# register the measure to be used by the application 
 AddHorizontalTrenchFieldForGSHP.new.registerWithApplication
 
 

Hopefully this will be helpful to someone.